传输损耗是一种客观评定方法，它以音频（）HZ为基准，以（）dB为

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问题单项选择题

传输损耗是一种客观评定方法，它以音频（）HZ为基准，以（）dB为确定的依据。

A.800，30

B.800，10

C.1500，30

D.1000，20

答案

参考答案：A

填空题

选用适当的词组填空。

in the daytime, e-mail me at, broke down, caught fire, in need, put it out

1. When the gas is on fire, don't try to __________ yourself. Call 119 at once.

2. The school bus __________ on the way this mornig, and many students were late for school.

3. Bats sleep __________ and hunt for food at night.

4. If you want to get more information, just __________ jakeson 1965 @ yahoo.com.

5. The school houses __________ because lightning hit them last summer.

单项选择题

下列关于血管紧张素转化酶抑制药（ACEI）的叙述，错误的是（）

A.可增强醛固酮的生成

B.可抑制缓激肽降解

C.可减轻心室扩张

D.可减少血管紧张素Ⅱ的生成

E.可降低心脏前、后负荷